Process and apparatus for drying coagulable liquids



Apfil 2'7,4 1926,` 1582 604 E. HoPKlNsoN Ef AL PROCESS AND PPARATUS FOR DRYING COAGULABLE LIQUIDS ERNEJ r HoPK/NSGN @r REEn f? F3055 .April 27, 192e. 1,582,604

E.HOPNSN TAL XROCESS AND APPARATUS FOR DRYING CUAGULABLE LIQUIDS Filed July 18. 1925 4 Sheets-Sheet :5

attenua? April 27 ,1926. l 1,582,604

E. HoPKlNspN ET A'.

PROGESS AND APPARATUS FOR`DRYING COAGULABLB LIQUIDS Filed July 18, 1923 4 Sheets-Sheet 4 Elwvantoza ERNssr HoPn/Nsond: Y R551? Rosi able soluble const remove thexn` CSI reason of tli Patented Apr. 27, 1926.Y

Pnocnss Am) APPARATUS ron Application med :aly 1s,

Coagulnble Liquids, is a full, clear, and exact descriptio `'lhisdnventionrelates to `a process and apparatus for drying coagulable liquids, more particularly as applied to the drying of rubber and similar latices, and is a continuation inpart of the application of Rose and Hopkinson, Serial N o. 508,408, filed October 17, 1921.

After the cultivatio onan extensive scal to provide a more r forobtaining the n of rubber was begun e it was found necessary apid and eilicient method crude rubber from the latexvthan the Widely'employed method of theV South American natives of dipping a peddle in a vessel of latex and holdingr 'it over a. fire of smoke prod ucing material and alternating these steps until a mass of coagulated rubb A er ofthe desired size was obtained. The process of coagulating thelatex by the. use of chemicals, such as acetic acid,- thereore came into wide use, but is open to many objections. An important one of these is that a considerable proportion of the valuituents of the latex ar liquor. yThe chemica recesses are also e pensive by e cost of the chemicals, and on accountof the extended washing necessary to after coagulation, and the' rub-` er must" of course also be driediilfgi numofV processes and va paratus have also been devised for coagu atingthe uatexmby supplying it in a thin film toa indringend-` less surface such as a rotating; drum, 4coagulating' this film -by the use of smoke` or smoke in conjunction with other co film of latex is comaterial, and as eachI agulatedsuperposing another l-m thereon ing the process until la relatively in the mother agulating and continu thic `mass of coagulated rubber has collected on the` drum and' then cutting the rubber away; This method is also open to numer objections,

.fber is allowed to PATENT OFFICE.

DnYING coAGULanLE Licorne 1928. Serial No. 852,311.

action a consider constituents esca e consequencesuch rubber is deleteriouisly effected. smoke coagulated product is also undesirable for also been proposed agulate latex by sup to a moving surface such as a form of which method the latex in a film to the exterior of a. heat is applied from the inte However, as the successiveiilms are dried on the drum in superposed relation the mass of rubber disposed between the drum and the film of latex on the exterior prevents a proper transmission of heat to the film, with 75 the result that the rubber is only imper- .fectly dried. In addition ere is danger of overhe o the drum, and th sorb moisture to a certain extent from the exterior film of 30 latex which is in the process of being dried., VDrum drying processes h lposed in rect-ly ap latex d' v ilrns of dried rubber s't iin any of these drum drying or coa vprocesses of the prior art in which t of coagulated or dried an build up ,1. processV cannot be continuo Vratunlpmst be stopped at intervals to cut away the rubber.` It has' been found very U6 advantageous to retain all the soluble consti he crude rubbex` p aratus have been deisclosed in patents to 525, July 25, 1922, and 100 No. 1,428,526, S and rapidly o e mass 00 droagulated rublayer by layer, the us, since the appa-` a vised, such as those Hopkinson, No. 1,423,A

VBradley andCon,

l 1922, ,l for directly y from the latex a. cru

los O11 some of the howeverthe output of ly large to warrant coni is to provide a simple,

Vzo

'film is dried independently tinuous operation of the drying apparatus or the expense involved in a large installation.

An object of the invention is to provide an improved process for film drying rubber latex. Another object is to provide a process for film drying latex in which a 'dried product containing ay minimum amount of moisture may be obtained when desired. A. further object is to provide a continuous process for film drying latex in which the of the previously dried material. A stil further object is to provide a process for drying latex in such manner as to form a crude rubber which is easy to mill. A still further object cheap and easily inanipulated apparatus for carrying out the The process consists broadly' in continu ously suppl *ing latex in a thin film to a. moving sur ace, withdrawing moisture from the iilxn, continuously reniovin the 'dried film from the dryingarea, an if desired superposing the film on 'itself in layers under pressure. The ap aratus comprises a moving continuous sur ace, such as a drum or belt, means for sup lying a lfilm of latex thereto, means for .rying the film, and means for continuously removing the dried film as a lm from the movingsurface before supplying latex thereto again.

For a full and complete disclosure of the invention reference is had tothe accompanying specification and drawings, in which latter: i

Fig. 1 is a front elevation of one forni of an apparatus for carrying out the process,

Fig. 2 is a side elevation of Fig. 1,

Fig. 3 is an elevation, partly in section, of one means for continuouslyv removing the dried lm of rubber latex, y

Fig. 4 is an elevation, partly in section,

of a modified means for supplying latex to the drum,

Fig. 5 is a front elevation, partly in section, of a modified form of drying apparatus, Y

Fig. 6 is an end view thereof on the line 6-6 of Fig. 5, A

Fi. 7 is a. section on the line 7-7 of Fig. 5, an

Fig. 8 is a detail of a modified means for removing the dried film.

Referring to Figs. 1 to'3, the nunieralpl 'designates a base or frame, in"vv'hich is mounted for rotation a drying drum 2, above which latter is disposed a hood 3. The drum is driven at a relatively slow speed by reduction gearing comprising a gear l mountwhicli ear meshes with a gear 5 mounted on the sha t of a gear 5', the latter in turn meshing with a gear 6 secured to a shaft on which are also mounted fast and loose pulleys 7 and 8, and

Yone arm of other end of said lever is connected by a` l cooperating with theserpulleys is a drive belt 8' which may be actuated from any suitable source of power. ln the present instance the drum is adapted to be internally heated by steam, and for th hollow shaft at one end of the drum communicates with a valve controlled steam inv let pipe 9'and that at the other end with the exhaust pipe 10.

Latex to be dried is supplied from the tank 11 through a pipe 12, provided with an automatically controlled valve 13, to a cylindrical auxiliary tank 14. At one end of this tank there is provided a perforated partition 15 forming a float chamber 16, in which latter is disposed a float 17, the stein .418Y of which passes through thc wall of the .i tank and has apin and slot connection with a bell crank lever 19, While the link 20 to the valve 13. The horizontal arm of the bell crank lever 19 is provided with an extension as shown in Fig. 1, by which it is purpose the may be manually operated when desired. f

Leading from the reservo-ir 14 is a flexible pipe '21 which is connected at its other end to a manifold 22 pivotally mounte'd in the frame 1. Rigidly secured to the manifold is a gear segment 23 meshing with a worm 24 operable by the hand wheel 25. Extending from the manifold 22 lare bracket arms 26 which carry a shallow latex pan 27, the boti tom of which is curved on an are concentric with the peri liery radius slight yjgreater than thatof the drum. The upper edges of the end walls of the drum are curved dius substantially that of the drum, as shown at 2S, so as to prevent escape of latex at the ends. `The pan is not provided with side Walls, and the edges of the bottom at the sides are curved downwardly as shown at 29. Leading from the manifold 22 are a series of pipe connections 30, of any suitable number, which open into the bottom of the San. Disposed below the pan is an overovv receptacle 31 provided in its bottom with an outlet covered by a screen 32, and leading from said outlet is, a return pipe 33 connected to the inlet of a suction pump 34, the outlet of which is connected by aY Y pipe 35 to the receptacle 11.

Mounted adjacent the 'drurn2 is a pick up roll 36 which is carried on slides 37, each slide bein connected by a link 38 to a lever 39 pivote on the frame, and connected of the drum 2 and of a on an arc having a rato the free end of each lever is a capte 40 j cured hub members 44. Covering the shell is a layer of felt 45, over which is disposed a covering 46 preferably of canvas, the ends of the canvas being turned down on the huh members and secured thereto by the fastenings 47. In order that the canvas covering may be drawn taut the hub ends 44 are provided with annular grooves 48, and retaining discs 49, havin annular projections 50 adapted to enter t e grooves 48, are secured in position on the hubs by screws 5l. 1t will be seen that when these screws are tightened up the canvas .covering will be forced down into the grooves 48 and drawn taut.

In certain circumstances it may be desirable to mix compounding ingredientswith the latex before drying the latter, and in this case the inodilied means for applying a iilui of latex to the pan shown in Fig. 4 has been found suitable. 1n this form alatex receptacle 52 is provided for containing the viniizture of latex and compounding ingredients, which may be supplied by means of the pipe 53, and the receptacle is so disposed that the surface of the drying drum 2 may just dip below the surface ot' the liquid. Small friction wheels 54 are mounted in the receptacle 52 in a position to frictionally engage the surface of the drum 2 and be driven thereby, and mounted on the same shaft as the friction Wheels 54 are propeller blades 55 which by their movement keep the mixture in circulation so as to prevent the separation of I the constituents of the mixture. The receptacle 52 may also be provided with a valve controlled drain pipe 56. While in the embodiment just described, the drying drum has been shown as provided with steam heating means, it is obvious that any other suitable means for heating the drum ma be used, such as one of the well known circulating oil heating systems. y

On those lantations which may not be provided wit e power plant or means for steam heating the drying drum, it may be desirable to provide even a simpler drying apparatus than that shown in Figs. 1 and 2, preferably one that ma be operated entirely manually, and in ig's. 5 to 7 such an apparatus is shown. This comprises a. pair of supports or uprights 57, which adjacent their upper ends are prpvided with enlarged, removable, tubular journals 58. Mounted for rotation on vthese journals are the hub ends 59 of the drying drum 6U, which latter is provided internally with any suitable form of baille, thatshown in the present instance being a closed cylinder 61. Attached to the outer end of one of the tubular'journals 58 is a damper controlled supply pipe 62 for furnishing a heated gaseous medium from the furnace 63. This medium may be heated air, combustion products, or a mixture of the two.` Connected to the outer end of the other tubular journal 58 is a damper controlled exhaust pipe 64. Secured to the hub ends 59 of the drying drum are gears 65, which are driven through the pinions 66 from the gears 67 mounted on the shaft 68 journalled in the frames 57. Secured on one end of the shaft 68 is a worm gear 69 meshing with auworni 70 which is operable by the hani e 71.

Latex is stored in the tank 72 and passes therefrom through the pipe 73 to a manifold 74, the How through the pipe 73 being controlled by a float operated valve 75 similar in all respects to the valve 13. Leading from the manifold 74 are a series of pipe connections 76, in each of which is disposed a flexible section 77, and the o po site ends of the pipe connections 76 cad into the bottom of a shallow latex pan 78, the bottoni of which is curved on an are concentric with and having a radius slightly greater than the drum 60. This pan is" provided with curved end walls 79 the tops of which closely approach the peripheryof the drum 60. The side walls are omitted as in the form shown in Fig. 2, and the bottom wall at its side edges is curved Adownwardly as shown at 80. Attached to the ends ot' the pan are supporting brackets 81 through which pass bolts 82, the outer ends of which are movable in curved slots 83 in the side frames 57, by means of which the pan may be adjusted in a direction circumfercntially of the drum, and nuts 84 are threaded on the ends of the bolts 82 to secure the pan in adjusted position. While under proper workin regulation there will be very little over ow of latex from the pan, a receptacle 85 is provided below the pan for the reception of any over- How or any coagulum. The drum 60 is provided with a pick-up roll 36 and its cooperating parts, which are similar in all respects to those shown in ,the form disclosed in Fie. 2.

In Fig. 8 tiere is shown a modified means for removing the dried latex film, this means comprising a scraper or knife 86 eo-exten sive with the length of the drying drum, this this knife being' secured to a knife-block mounted ou the lframe 57 at 88. Pivotally attached at one end to the knifeblock is a link 89, the other end of which is ivota.- ly connected tofa block 90 in whic is rtatable the end of an adjusting screw 91 threaded in a bracket 92 on the frame 57. i

At the other end the adjusting screw is provided with a hand wheel 93 which may be i .of the counter-wei hts 42th@ `the--solid `constituents of` the latex.` s eed 'of rotation of, thedruni 2 isfrelataely paratus shown in Figs. 1 and 2, the is heated and slowly rotated, and latex is allowed to flow from the tank 11 into the auxiliary tank 14 and from ythence into the latex supply pan 27. Steam at about twenty pounds pressure has been found suitable for ieating thefdrum, but this of course may be varied asmlon as the drum is not heated suicintly to injure `the rubber.- The operating mechanism of the float valve 13 is so adyusted that -the'li uid in the reservolr 14 willbe kept at aevel slightlylhigher than the', bottom of pan 'so' that the rotating- .dru'x'n 2-will diplshghtly into the latex in the panQLqBy reason'oi this the periphery ot.'V drinn, 2 'as it@ passes out of the pan willcar on its'suraoeiathin film of latex :5 6; an A du riugf'the rerolutio'nm of the drum this film will be dried sfByreason se win'egmct .wir thenrume nde sideraloleV pressure, andas film enga esthe ii'ekfnprollnitfadheres.

to the sur ce of t e latter,is strip 'dfrom the drinn' 2 Vand rolls upon thefrolle. It will be seen that'b the. proces'sabove outl lined the `film `o Y latex@isi-continuously formed,` continuously dried; and continuous-4r ly removedjrom the drnnn The filmini 'latex is therefore always dried in direct Contact with the drum `2, and not While su perposed on previously dried films as in the prior artr Hence, the drying is uniform; rapidand: thorough, there is .no reabsorr'i-` tion of moisture. y the portions of film previously dried, the. rubber. film is not oi/'erf` heatedby prolonged Contact with the-drum, and owingfto the ra idityof the drying there is no chancellor' tlie y taining desirable soluble elements, from sep-, v arating out, and the resultingdried` film is a homogeneous product containing allfoiY s ow, and' a' dried, product V1ruaty beobtain d with as low" a moisture contentasg(l.3% 'L if isle-sip. roll;

id laterz,` 'propeller bla,

mother liquor, con-i float valve arrangement cannot readily become clogedb reasonv of-the formation of coagu um.. f by reason of imprrper regulation of the oat valve any over ow this case the latex supply means shown 1nv Fid. 4 may be'used. 1n this form the body ,pftlatex in the pan 52 will be kept at a level E such lthat the drum 2 lwill slightly dip below its surface. By reasonol the frictional contact ofthe drum `withfi the wheels 54 the dwill be continually actuated to Inainarl thelaftexpin motion, preventing thes'ettling out-fofrany o its compounding ingredients` `Thehpieloup roll shownjin Fig. 3 liaslieen found to be very ,"sitisfaotory {org-the vpurpose of stripping tie ticularly fitlie canvas outer covering 46 :has been preliminarily coated with latex,

and as the roll 36 is rotated the dried lihn is collected thereon in snperposed layers which are united under pressure. When a f sullicient quantity of dried latex has ac-1 jenmnlated-ontheroll`36 the latter is re 1 moyed` 'an .y empty one I substituted y and the Ldried'rubbercut'alnd rernoredjrom the full j'oll. "igAs 1 stripped; freingthe` drying drum yt-plie; filmfofgdr-ied-Q-.latex Lis fin-,the form of a Vhomogeneous1*sheet o,..lrorn 0.1 -to 0.4 mm. thickness.; :While in theipresent apparatus u. "drumhas-,been shown for-drying the later; .that other Storms 4of device-'s for 1drying't Y e latex maybe used, such as an endless metalliobelt, rotating plate, letc' D i i desired. 1 However, :for certain purposes 'arw out fofitheiY` recess Awhen product i containing s a somewhat? greater.`

amount otmoisture may be desired and.- by)- varying the speed of rotation and the degree of'heat the moisturey content may be readily controlled. It will be seen theta-,only a Averysmall quantity of latex is. in direct.eontaetY with the heated drum, and by proper regulation of the float. valve the latex may besup! 'glied in 'ust sufficient qnantity-,toform the lm on. e drum, and byreason of this arrangement the aniountof coagulurn vformed in thel pan 27 isreducedto a minimnrn However, should any coagulurn forni it is rolled out of the 'pan and over the vdownwardly curved'side edge of the bottom by thenetion of the rotating drum. As the supply of latex in the float chamber is endried lilm from the drying drum, par-f before. before, stated this the pipeff. iThe drum` drum 2 tirely Vremoved from the heating zone the 65 :produced bythe combustion Iif fuel-"by the furnace 63, and

may lie-:given .a desired slow movement of rotation by the operative turning thehandle 7 1. In this formlo apparatus, the mount` Vberaised to a slightly higher level than the side'by which it leaves, which aids in the removal of stringere of coaguluni formed in the pan, these stringers being then more easily rolled out of the lower side of the pan. If desired any other suitable form of piclcup roll may be substituted for that shown in Fig. 3 or the knife shown in Fig. 8 may be used with either of the forms of drying apparatus shown. lVhen using the knife the film of dried latex cut from the drinn rolls up on itself us it passes down the table'95. Either of the latex supply pan adjusting means shown may also be substituted for the other.

It may be seen that b our rocess a homogeueous, thoroughly (filed fi m of rubber la tex containing all of the solid constituents thereof may be obtained, and that the proe ess is easily re ulated and rapid and economical for smaller plantation in which the cost of the spray drying apparatus would be prohibitive. lVhile as before stated' it may be desirable for some purposes to retain a variable small amount of moisture in the product, the hitter is essentially a dried rubber as distinfruished from a wet coagulum, and it is obtained by a single drying operation carried out between the formation of a latex film on a surface and the removal of the film in a predetermined dried condiytion from said surface.

Itis evident that with the above detailed disclosure of the invention man -rnodifications will suggest themselves to t iose skilled in the art, an`d it is not desired to limit the invention otherwise than as set forth in the ap ended claims. n laving thus described our invention, what we 'claim and desire totprotect by Letters Patent isz#- 1.. The process of drying latex comprising4 eva orating 'a layer of latex on a surface, an continuously removing the evaporate layer from the surface. f

2. The process of dryin latex comprisin evaporating a thin film o latex on a lieate 'moving surface, and continuously removing the thin film after evaporation.

3. Tlie processl of drying latex which consists in continuously forming a thin 'film of latex directly on a supporting surface,.dry` ing the film while in Contact therewith, and continuously' removing the dried film.

4. The process of dryin latex comprising supplying a thin film of illitex to a rotating surface, evaporating fluid from said thin film, und removing the dried residue before one complete revo ution of said rotnting surface.

5. The process of drying latex which consists in withdrawing moisture therefrom while in a thin film, and bodily removing ilid simultaneously compacting the dried 6. The process of drying latex which consists in continuously forming athin film of the latex, withdrawing moisture therefrom while in such form, and continuously bodily removing the dried film.

,7. The process of drying latex which consists in forming a thin film of the latex, withdrawing moisture therefrom .while in such forni, and continously superposing the dried film in. layers. l

8. The process of drying latex which consists. in forming a thin film Iof the'latex, withdrawing moisture therefrom While in such form, and rolling-up the dried film on itself.`

9. The process of drying latex which consists in continuously forming a thin film of the latex, withdrawing moisture therefrom while in such form, and continuously superposing the dried film in layersV under pressure.

10. 'Ihe process of dryin r latex comprising supplying a thin film of laten: to the outer curved surface of an internally heated rotilting cylinder by causinr the cylinder to contmously rotaie througi a small supply of latex, supplying a uniform flow of latex thereto-at a rate e ual to its removal therefrom by the cylin er, and continuously 1e movin the dried-latex from the cylinder.

-11. he process of drying latex comprising' supplying a thin film of latex to the Outer curved surface of an. internally heated rotary cylinder by causing the cylinder to continuously rotate through a small supply of latex, supplying a uniform flow of latex thereto at arateI e ual to its removal therefrom by the cylin er, removin lated latexv vfrom the latex supp y by the ro- 'tation of the'cylnder, -and ycontinuously removin the dried latex from the cylinder.

112.;- eprocess of dr ing latex compris ing supplying'V a thin Y In of latent to the outer curved surface of an internally heated rotary cylinder by causing the cylinder to continuously rotate through a small supply of latex in a small pan positioned beneath the cylinder, maintaining a constant level of Ila-toxin the paii by supplying a uniform flow oilatex ithereto at a rate equal to its removal therefrom by the cylinder, and continuousl removing the dried latex from the cylin er.

13. The recess of drying latex comprising supplying a tliin film of latex to the outer curved surface of an internally heated rotary cylinder by causing the cylinder to continuously rotate through a small supply.of latex in a small pan positioned` be neath the e linder so that one of its rims will be lower t an the other, thereby facilitatand simultaneously eompacting j any coaguing the removal of ooagulated latex formed in the pan by causing it to be forced over the lower rim by the rotation of the cylinder, maintaining a constant leyel of latex in the pan by supplying a uniform flow of latex thereto at a rate e ual to 4its 4removal therefrom by the cylin er, and continuously removing the dried latex from the cylinder at a line near the hi her rim of the pan.

14. Apparatus or drying latex comprising a movable carrier having a continuous surface, means for continuously supplying latex thereto in a thin film, means for drying the film, and means disposed in advance of said supply means for continuously stripping off the dried jlm and superposing it on itself under pressure.

15. Apparatus for drying latex comprising Inova le means having Aan endless drying sur'face, means for continuously supplyingl latex thereto in a thin Film, means for drying the film, and means adapted to adhesively Contact with the film in advance of said supply means for continuously stripping it 1 from said surface.

16. Apparatus for drying latex comprising movable means for drying latex in a continuous thin film, and means exteriorly contacting with the dried lilm for simultaneously removing and suprerposing it in layers.

17. ApparatusV for ying latex comprising a carrier having a continuous surface, means for continuously supplying latex thereto in a thin film, means for-drying the film, and a roll adapted to adhesively press against and remove the dried film.

1 8. Apparatus fordrying latex comprising ANew a rotatable drum, means for supplying latex in a thin film thereto, means for drying said va rotatable drum, a shallow latex film, and a pick-uproll adapted to yieldinglyhlclontact with, remove and roll up the dried dried film, and means whereby the roll may be yieldingly urged under variable pressure against said film.

20. Apparatus for drying latex comprising pan cooperatin therewith to supply a thin film'o latex t ereto, said pan being formed to ermit lthe automatic removal of coagu um therefrom by the drum, means for drying the film, and means for continuously remov- 4ing the dried film.

21. pick-up roll for film dried latex comprisinga roll body, a resilient covering therefor, and a detachable outer covering adapted to adhere to freshly dried latex.

22. A pick-up roll for comprising a roll body a feltcoveringtheefor, and a detachable fabric'outer covering adapted to adhere to freshly dried latex.

23. A pick-up prising aroll ody, a felt covering therefor,

`a canvas outer covering, and means for detachably retaining said outer covering in position and under tension.

Signed at New York, county'and State of 'New York, this 17th day of July, 1923.

' ERNEST HOPKINSON.

Si 1 ied at New York, county and State of orlr, this 16th day of July,'1923.

REED P. ROSE.

roll for film dried latexl comi film driedlatex 4ing the removal of coagulated latex formed in the pan by causing it to be forced over the lower rim by the rotation of the cylinder, maintaining a' constant leyel of latex in the pan by supplying a uniform flow of latex thereto at a rate e ualto its removal therefrom by the c lin er, and continuously removing the dried latex from the cylinder at a line near the hi her rim of the pan.

14. Apparatus ger drying latex comprising a movable carrier having a continuous surface,'means for continuously sutpplying latex thereto in a thin film, means or drying the film, and means disposed in advance of said supply means for continuously stripping off the dried tilm and superposing it on itself under pressure.

15. Ap aratus for drying latex compris.- ing movable means having Aan endless drying surface, means for continuously supplyingV latex thereto in a thin film, meansl or dry' ing the film, and means adapted to: adhesivesupply means for continuously from said surface. 4 16. Apparatus for drying latex comprising movable means for drying latex in a continuous thin film, and means exteriorly constripping it ta'cting with the dried film for simultane-v ously removing and su erposing it in layers.

17. Apparatus for ,A ying latex comprising a carrier having a continuous surface,

' means for continuously supplying latex thereto in a thin film, means for-drying the against and remove the dried film.

18. Ap aratus for 'drying latex comprising vNew a rdtatab e drum, means for supplying latex in a thin film thereto, means for drying said n is hereby certified that `a rotatable drum, a shallow latex Certificate 'of Correction. I

in Letters Patent No. 1,582,604, upon the appiieationfof Ernest Hopkinson and ReedP. fRose, of New y for an improvement in Processes' and Apparatus for Drying Con dried film, and means whereby the roll may be yieldingly urged under variable pressure against said film.

Q0. Apparatus for drying latex comprising i pan cooperating therewith to supply a thm film'of 'latex thereto, said pan being formed to ermit the automatic removal of coagu um 4therefrom by the drum, means for drying the film, and means for continuously removing the dried film.

21. A. pick-u roll for film dried latex comprisinga ro l body, a resilient covering therefor, and a detachable outer covering ly contact with the film in advance-of said adapted to adhere to `freshly dried latex.

'22. A pick-up roll-for film driedlatex comprising a roll body a feltf coveringthee- E for, and a detachable fabric' outer covering adapted tor adhere to freshly dried latex.

23. A pick-u roll. for film dried latexl cornprising agroll ody, a felt covering therefor,

`a canvas outer covering, and means for detachably retaining said outer covering in position andl under tension.

Signed at New York, county'and State of New Yorlgthis 17thday of'July, 1923. film, and a roll adapted to adhesively press p f, t

j ERNEST HOPKINSON.

Si ed yat New York, county and State of ork, this 16th day of J uly, 1923.

REED P. ROSE.

granted A riian'ie'ee, Ork, N. Y., lable Liquids,

errors appear in the printed specification requiring correction4 as ollows: Page2, line 102, for the word drum read pan, and line 122, ,for the misspelled word caple read cable; page 3, line 19, for the Word pan readdrum; and that the said Letters Patent should be read with these corrections therein conform to the record of the case in the Patent Office.

Signed and sealed this 8th day of June, A. D. 1926.

i mi

that the same may "M J. Moons, Acting Oommaez'onw of Patents.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,582,604, granted April 27,1926, upon the application of Ernest Hopkinson and Reed P, Rose, ofy New York, N. Y., for an improvementl in Processes and Apparatus for Drying Coagulable Liquids, errors appear in the printed specification requiring correction as follows: Page 2, line 102, for the Word drum read pan, and line 122, for the misspelled word caple read cable.; page 3, line 19, for the word pan read drum; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 8th day of J une, A. D. 1926.

[mn] M. J. MOORE,

Acting Commissioner of Patents. 

